Ministry of Earth Sciences
Thunderstorm with lightning & gusty wind  very likely at isolated places over Himachal Pradesh, Uttarakhand, Jharkhand, Assam, Meghalaya, Gangetic West Bengal, Kerala, Mahe & Lakshadweep on 20th May
Heavy Rainfall at isolated places very likely over Sub-Himalayan West Bengal, Sikkim, Andaman Nicobar Islands, Assam & Meghalaya, on 21st May
Heavy Rainfall likely at isolated places over Andaman & Nicobar Islands on 24th May
According to the National Weather Forecasting Centre of the India Meteorological Department :
All India Impact Based Weather Warning Bulletin 
20 May : ♦ Thunderstorm with lightning & gusty wind  very likely at
isolated places over Himachal Pradesh, Uttarakhand, Jharkhand, Assam & Meghalaya, Gangetic West Bengal, Kerala & Mahe and Lakshadweep and with lightning at isolated places over Uttar Pradesh, Madhya Pradesh, Vidarbha, Chhattisgarh, Bihar, Sub-Himalayan West Bengal & Sikkim, Odisha, Andaman & Nicobar Islands, Arunachal Pradesh, Nagaland, Manipur, Mizoram & Tripura, Konkan & Goa, Coastal Andhra Pradesh & Yanam, Coastal & South Interior Karnataka and Tamil Nadu, Puducherry & Karaikal.
- Heavy to Very Heavy Rainfall at isolated places very likely over Uttarakhand and Sub-Himalayan West Bengal & Sikkim and Heavy Rainfall at isolated places over Arunachal Pradesh, Assam & Meghalaya, West Uttar Pradesh and Tamil Nadu, Puducherry & Karaikal.
- Squally wind  likely to prevail over Southeast Bay of Bengal & adjoining South Andaman Sea. Fishermen are advised not to venture into these areas. Fishermen are advised not to venture into these areas.
21 May : ♦Thunderstorm with lightning & gusty wind  very likely at isolated places over Andaman & Nicobar Islands; with lightning & gusty wind  at isolated places over Jharkhand, Gangetic West Bengal, Odisha, Kerala & Mahe and
Lakshadweep and with lightning at isolated places over Bihar, Sub-Himalayan West Bengal & Sikkim, Vidarbha, Assam & Meghalaya, Coastal Andhra Pradesh & Yanam, Coastal & South Interior Karnataka and Tamil Nadu, Puducherry & Karaikal.
- Heavy Rainfall at isolated places very likely over Sub-Himalayan West Bengal & Sikkim, Andaman & Nicobar Islands and Assam & Meghalaya.
- Squally wind  likely to prevail over Southwest Arabian Sea, Southwest & adjoining West central Bay of Bengal, and along & off Tamil Nadu-Andhra Pradesh coasts; East central Bay of Bengal and adjoining South Andaman Sea. Fishermen
are advised not to venture into these areas.
22 May : ♦ Thunderstorm with lightning & gusty wind  likely at isolated places over Andaman & Nicobar Islands; with lightning & gusty wind  at isolated places over West Rajasthan, Bihar and Kerala & Mahe and with lightning at isolated
places over Coastal & South Interior Karnataka, Tamil Nadu, Puducherry & Karaikal and Lakshadweep.
- Heavy to Very Heavy Rainfall at isolated places likely over Andaman & Nicobar Islands.
- Squally wind  likely to prevail over Southwest Arabian Sea. Squally wind  likely over Southwest &
adjoining West central Bay of Bengal, and along & off Tamil Nadu-Andhra Pradesh coasts, East central Bay of Bengal and adjoining Andaman Sea. Fishermen are advised not to venture into these areas.
23 May : ♦Thunderstorm with lightning & gusty wind  likely at isolated places over Andaman & Nicobar Islands; with lightning & gusty wind  at isolated places over West Rajasthan and Kerala & Mahe and with lightning at isolated
places over Coastal & South Interior Karnataka, Tamil Nadu, Puducherry & Karaikal and Lakshadweep.
- Heavy Rainfall likely at isolated places over Andaman & Nicobar Islands.
- Squally wind speed reaching 40-50 kmph gusting to 60 kmph likely to prevail over Southwest Arabian Sea, 45-55 kmph gusting to 65 kmph likely over Southwest & adjoining West central Bay of Bengal, and along & off Tamil Nadu-Andhra Pradesh-south Odisha coast, 55-65 kmph gusting to 75 kmph likelyover
East central Bay of Bengal and adjoining Andaman Sea. Fishermen are advised not to venture into these areas.
24 May : ♦Thunderstorm with lightning & gusty wind  likely at isolated places over Andaman & Nicobar Islands; with lightning & gusty wind  at isolated places over West Rajasthan and Kerala & Mahe and with lightning at isolated
places over Coastal & South Interior Karnataka, Tamil Nadu, Puducherry & Karaikal and Lakshadweep.
- Heavy Rainfall likely at isolated places over Andaman & Nicobar Islands.
- Squally wind speed reaching 40-50 kmph gusting to 60 kmph likely to prevail over Southwest Arabian Sea, 45-55 kmph gusting to 65 kmph likely over Southwest & adjoining West central Bay of Bengal,
and along & off Tamil Nadu-Andhra Pradesh-south Odisha coast, 55-65 kmph gusting to 75 kmph likely over East central Bay of Bengal and adjoining Andaman Sea. Fishermen are advised not to venture into these areas.